Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Back Door Motor Internal Electronic Failure (B222049)

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Exterior / Door / Hatch / Power Back Door System / Back Door Motor Internal Electronic Failure (B222049)

DESCRIPTION

This DTC is stored when the multiplex network door ECU detects a malfunction of the motor built-into the power back door unit assembly set LH or power back door unit assembly set RH.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B222049

Back Door Motor Internal Electronic Failure

Malfunction of motor built into the power back door unit assembly set LH or power back door unit assembly set RH detected

  • Multiplex network door ECU
  • Power back door unit assembly set LH
  • Power back door unit assembly set RH
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the multiplex network door ECU has been removed and installed or replaced, or if any of the connectors has been disconnected, initialize the power back door system.

Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Back Door > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Back Door > Trouble Codes

Result

Proceed to

B222049 is output

A

B222049 is not output

B

B

USE SIMULATION METHOD TO CHECK

A

3.

INSPECT POWER BACK DOOR UNIT ASSEMBLY SET LH

(a) Fully open the back door.

(b) Disconnect the power back door unit assembly set LH connector.

*a

Component without harness connected

(Power Back Door Unit Assembly Set LH)

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

U14-1 (BD+) - Body ground

Always

10 kΩ or higher

U14-2 (BD-) - Body ground

Always

10 kΩ or higher

U14-1 (BD+) - U14-2 (BD-)

Always

Below 1 MΩ

NG

REPLACE POWER BACK DOOR UNIT ASSEMBLY SET LH

OK

4.

INSPECT POWER BACK DOOR UNIT ASSEMBLY SET RH

(a) Fully open the back door.

(b) Disconnect the power back door unit assembly set RH connector.

*a

Component without harness connected

(Power Back Door Unit Assembly Set RH)

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

U13-1 (BD+2) - Body ground

Always

10 kΩ or higher

U13-2 (BD-2) - Body ground

Always

10 kΩ or higher

U13-1 (BD+2) - U13-2 (BD-2)

Always

Below 1 MΩ

NG

REPLACE POWER BACK DOOR UNIT ASSEMBLY SET RH

OK

5.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - POWER BACK DOOR UNIT ASSEMBLY SET LH)

(a) Disconnect the U41 multiplex network door ECU connector.

(b) Disconnect the U14 power back door unit assembly set LH connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

U41-1 (BD+) - U14-1 (BD+)

Always

Below 1 Ω

U41-3 (BD-) - U14-2 (BD-)

Always

Below 1 Ω

U41-1 (BD+) or U14-1 (BD+) - Body ground

Always

10 kΩ or higher

U41-3 (BD-) or U14-2 (BD-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - POWER BACK DOOR UNIT ASSEMBLY SET RH)

(a) Disconnect the U41 multiplex network door ECU connector.

(b) Disconnect the U13 power back door unit assembly set RH connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

U41-6 (BD+2) - U13-1 (BD+2)

Always

Below 1 Ω

U41-8 (BD-2) - U13-2 (BD-2)

Always

Below 1 Ω

U41-6 (BD+2) or U13-1 (BD+2) - Body ground

Always

10 kΩ or higher

U41-8 (BD-2) or U13-2 (BD-2) - Body ground

Always

10 kΩ or higher

OK

REPLACE MULTIPLEX NETWORK DOOR ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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